Photo taken on Nov. 25, 2019 shows plants growing inside a karst sinkhole in Donglan County, south China's Guangxi Zhuang Autonomous Region. A cave exploration team has discovered two giant karst sinkholes, also known as Tiankeng in Chinese, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
Member of a cave exploration team shows a real-time drone image of a giant karst sinkhole called "Xiaonongkun Tiankeng 2" on his mobile phone in Donglan County, south China's Guangxi Zhuang Autonomous Region, Nov. 26, 2019. A cave exploration team has discovered two giant karst sinkholes, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
Members of a cave exploration team investigate a limestone cave in Donglan County, south China's Guangxi Zhuang Autonomous Region, Nov. 27, 2019. A cave exploration team has discovered two giant karst sinkholes, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
Member of a cave exploration team prepares to investigate a giant karst sinkhole called "Xiaonongkun Tiankeng 2" in Donglan County, south China's Guangxi Zhuang Autonomous Region, Nov. 26, 2019. A cave exploration team has discovered two giant karst sinkholes, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
Photo taken on Nov. 25, 2019 shows bats living inside a limestone cave in Donglan County, south China's Guangxi Zhuang Autonomous Region. A cave exploration team has discovered two giant karst sinkholes, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
Photo taken on Nov. 25, 2019 shows the herbaceous plants growing at the bottom of a karst sinkhole in Donglan County, south China's Guangxi Zhuang Autonomous Region. A cave exploration team has discovered two giant karst sinkholes, and over a dozen smaller limestone caves in the mountainous county after a week of expedition. The 30-membered team, which consisted of speleologists and cavers from China, France and Belgium, went through field measurements and found one of the two giant sinkholes, measuring over 300m in depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. (Photo by Chen Lixin)
